diff options
author | Ahmed S. Darwish <a.darwish@linutronix.de> | 2021-01-18 13:09:40 +0300 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-01-23 05:31:07 +0300 |
commit | feb18e900f0048001ff375dca639eaa327ab3c1b (patch) | |
tree | 96c744abf5d0f802724c869341443629b1b1fbb6 /drivers/scsi/mvsas | |
parent | c2d0f1a65ab9fbabebb463bf36f50ea8f4633386 (diff) |
scsi: mvsas: Pass gfp_t flags to libsas event notifiers
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.
Link: https://lore.kernel.org/r/20210118100955.1761652-5-a.darwish@linutronix.de
Fixes: 1c393b970e0f ("scsi: libsas: Use dynamic alloced work to avoid sas event lost")
Cc: Jason Yan <yanaijie@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/mvsas')
-rw-r--r-- | drivers/scsi/mvsas/mv_sas.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c index e5e3e95f78b0..484e01428da2 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 +1892,21 @@ 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 +2023,7 @@ 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); |