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From: "Ahmed S. Darwish" <a.darwish@linutronix.de>
To: "James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	John Garry <john.garry@huawei.com>,
	Jason Yan <yanaijie@huawei.com>, Daniel Wagner <dwagner@suse.de>,
	Artur Paszkiewicz <artur.paszkiewicz@intel.com>,
	Jack Wang <jinpu.wang@cloud.ionos.com>
Cc: linux-scsi@vger.kernel.org, intel-linux-scu@intel.com,
	LKML <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Sebastian A. Siewior" <bigeasy@linutronix.de>,
	"Ahmed S. Darwish" <a.darwish@linutronix.de>
Subject: [PATCH v2 04/19] scsi: mvsas: Pass gfp_t flags to libsas event notifiers
Date: Tue, 12 Jan 2021 12:06:32 +0100
Message-ID: <20210112110647.627783-5-a.darwish@linutronix.de> (raw)
In-Reply-To: <20210112110647.627783-1-a.darwish@linutronix.de>

mvsas calls the non _gfp version of the libsas event notifiers API,
leading to the buggy call chains below:

  mvsas/mv_sas.c: mvs_work_queue() [process context]
  spin_lock_irqsave(mvs_info::lock, )
    -> libsas/sas_event.c: sas_notify_phy_event()
      -> sas_alloc_event()
        -> in_interrupt() = false
          -> invalid GFP_KERNEL allocation
    -> libsas/sas_event.c: sas_notify_port_event()
      -> sas_alloc_event()
        -> in_interrupt() = false
          -> invalid GFP_KERNEL allocation

Use the new event notifiers API instead, which requires callers to
explicitly pass the gfp_t memory allocation flags.

Below are context analysis for the modified functions:

=> mvs_bytes_dmaed():

Since it is invoked from both process and atomic contexts, let its
callers pass the gfp_t flags. Call chains:

  scsi_scan.c: do_scsi_scan_host() [has msleep()]
    -> shost->hostt->scan_start()
    -> [mvsas/mv_init.c: Scsi_Host::scsi_host_template .scan_start = mvs_scan_start()]
    -> mvsas/mv_sas.c: mvs_scan_start()
      -> mvs_bytes_dmaed(..., GFP_KERNEL)

  mvsas/mv_sas.c: mvs_work_queue()
  spin_lock_irqsave(mvs_info::lock,)
    -> mvs_bytes_dmaed(..., GFP_ATOMIC)

  mvsas/mv_64xx.c: mvs_64xx_isr() || mvsas/mv_94xx.c: mvs_94xx_isr()
    -> mvsas/mv_chips.h: mvs_int_full()
      -> mvsas/mv_sas.c: mvs_int_port()
        -> mvs_bytes_dmaed(..., GFP_ATOMIC);

=> mvs_work_queue():

Invoked from process context, but it calls all the libsas event notifier
APIs under a spin_lock_irqsave(). Pass GFP_ATOMIC.

Fixes: 1c393b970e0f ("scsi: libsas: Use dynamic alloced work to avoid sas event lost")
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Cc: John Garry <john.garry@huawei.com>
Cc: Jason Yan <yanaijie@huawei.com>
---
 drivers/scsi/mvsas/mv_sas.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index e5e3e95f78b0..e80f760f8abd 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -216,7 +216,7 @@ void mvs_set_sas_addr(struct mvs_info *mvi, int port_id, u32 off_lo,
 	MVS_CHIP_DISP->write_port_cfg_data(mvi, port_id, hi);
 }
 
-static void mvs_bytes_dmaed(struct mvs_info *mvi, int i)
+static void mvs_bytes_dmaed(struct mvs_info *mvi, int i, gfp_t gfp_flags)
 {
 	struct mvs_phy *phy = &mvi->phy[i];
 	struct asd_sas_phy *sas_phy = &phy->sas_phy;
@@ -229,7 +229,7 @@ static void mvs_bytes_dmaed(struct mvs_info *mvi, int i)
 		return;
 	}
 
-	sas_notify_phy_event(sas_phy, PHYE_OOB_DONE);
+	sas_notify_phy_event_gfp(sas_phy, PHYE_OOB_DONE, gfp_flags);
 
 	if (sas_phy->phy) {
 		struct sas_phy *sphy = sas_phy->phy;
@@ -261,7 +261,7 @@ static void mvs_bytes_dmaed(struct mvs_info *mvi, int i)
 
 	sas_phy->frame_rcvd_size = phy->frame_rcvd_size;
 
-	sas_notify_port_event(sas_phy, PORTE_BYTES_DMAED);
+	sas_notify_port_event_gfp(sas_phy, PORTE_BYTES_DMAED, gfp_flags);
 }
 
 void mvs_scan_start(struct Scsi_Host *shost)
@@ -277,7 +277,7 @@ void mvs_scan_start(struct Scsi_Host *shost)
 	for (j = 0; j < core_nr; j++) {
 		mvi = ((struct mvs_prv_info *)sha->lldd_ha)->mvi[j];
 		for (i = 0; i < mvi->chip->n_phy; ++i)
-			mvs_bytes_dmaed(mvi, i);
+			mvs_bytes_dmaed(mvi, i, GFP_KERNEL);
 	}
 	mvs_prv->scan_finished = 1;
 }
@@ -1892,20 +1892,20 @@ static void mvs_work_queue(struct work_struct *work)
 			if (!(tmp & PHY_READY_MASK)) {
 				sas_phy_disconnected(sas_phy);
 				mvs_phy_disconnected(phy);
-				sas_notify_phy_event(sas_phy,
-					PHYE_LOSS_OF_SIGNAL);
+				sas_notify_phy_event_gfp(sas_phy,
+					PHYE_LOSS_OF_SIGNAL, GFP_ATOMIC);
 				mv_dprintk("phy%d Removed Device\n", phy_no);
 			} else {
 				MVS_CHIP_DISP->detect_porttype(mvi, phy_no);
 				mvs_update_phyinfo(mvi, phy_no, 1);
-				mvs_bytes_dmaed(mvi, phy_no);
+				mvs_bytes_dmaed(mvi, phy_no, GFP_ATOMIC);
 				mvs_port_notify_formed(sas_phy, 0);
 				mv_dprintk("phy%d Attached Device\n", phy_no);
 			}
 		}
 	} else if (mwq->handler & EXP_BRCT_CHG) {
 		phy->phy_event &= ~EXP_BRCT_CHG;
-		sas_notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
+		sas_notify_port_event_gfp(sas_phy, PORTE_BROADCAST_RCVD, GFP_ATOMIC);
 		mv_dprintk("phy%d Got Broadcast Change\n", phy_no);
 	}
 	list_del(&mwq->entry);
@@ -2022,7 +2022,7 @@ void mvs_int_port(struct mvs_info *mvi, int phy_no, u32 events)
 				mdelay(10);
 			}
 
-			mvs_bytes_dmaed(mvi, phy_no);
+			mvs_bytes_dmaed(mvi, phy_no, GFP_ATOMIC);
 			/* whether driver is going to handle hot plug */
 			if (phy->phy_event & PHY_PLUG_OUT) {
 				mvs_port_notify_formed(&phy->sas_phy, 0);
-- 
2.30.0


  parent reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-12 11:06 [PATCH v2 00/19] scsi: libsas: Remove in_interrupt() check Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 01/19] Documentation: scsi: libsas: Remove notify_ha_event() Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 02/19] scsi: libsas and users: Remove notifier indirection Ahmed S. Darwish
2021-01-12 11:36   ` John Garry
2021-01-12 12:09     ` Ahmed S. Darwish
2021-01-12 13:07     ` [PATCH v3 " Ahmed S. Darwish
2021-01-12 15:43       ` Christoph Hellwig
2021-01-12 11:06 ` [PATCH v2 03/19] scsi: libsas: Introduce a _gfp() variant of event notifiers Ahmed S. Darwish
2021-01-12 15:45   ` Christoph Hellwig
2021-01-12 17:12     ` Sebastian A. Siewior
2021-01-12 11:06 ` Ahmed S. Darwish [this message]
2021-01-12 15:46   ` [PATCH v2 04/19] scsi: mvsas: Pass gfp_t flags to libsas " Christoph Hellwig
2021-01-12 17:03     ` Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 05/19] scsi: isci: port: link down: Pass gfp_t flags Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 06/19] scsi: isci: port: link up: " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 07/19] scsi: isci: port: broadcast change: " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 08/19] scsi: libsas: Pass gfp_t flags to event notifiers Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 09/19] scsi: pm80xx: Pass gfp_t flags to libsas " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 10/19] scsi: aic94xx: " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 11/19] scsi: hisi_sas: " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 12/19] scsi: libsas: event notifiers API: Add gfp_t flags parameter Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 13/19] scsi: hisi_sas: Switch back to original libsas event notifiers Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 14/19] scsi: aic94xx: " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 15/19] scsi: pm80xx: " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 16/19] scsi: libsas: Switch back to original event notifiers API Ahmed S. Darwish
2021-01-12 14:42   ` John Garry
2021-01-12 11:06 ` [PATCH v2 17/19] scsi: isci: Switch back to original libsas event notifiers Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 18/19] scsi: mvsas: " Ahmed S. Darwish
2021-01-12 11:06 ` [PATCH v2 19/19] scsi: libsas: Remove temporarily-added _gfp() API variants Ahmed S. Darwish
2021-01-12 11:53 ` [PATCH v2 00/19] scsi: libsas: Remove in_interrupt() check John Garry
2021-01-12 13:19   ` Ahmed S. Darwish
2021-01-12 16:00     ` John Garry
2021-01-12 17:33       ` Ahmed S. Darwish
2021-01-14  9:51         ` John Garry
2021-01-15 16:27           ` Ahmed S. Darwish
2021-01-15 16:29             ` John Garry
2021-01-15 16:41               ` Ahmed S. Darwish

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