From: Nilesh Javali Date: Mon, 13 Mar 2023 04:37:10 +0000 (-0700) Subject: scsi: qla2xxx: Perform lockless command completion in abort path X-Git-Tag: baikal/mips/sdk5.8.2~77 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=11128037cf14b2b5b5373cd08fa8bcfd8ab38307;p=kernel.git scsi: qla2xxx: Perform lockless command completion in abort path commit 0367076b0817d5c75dfb83001ce7ce5c64d803a9 upstream. While adding and removing the controller, the following call trace was observed: WARNING: CPU: 3 PID: 623596 at kernel/dma/mapping.c:532 dma_free_attrs+0x33/0x50 CPU: 3 PID: 623596 Comm: sh Kdump: loaded Not tainted 5.14.0-96.el9.x86_64 #1 RIP: 0010:dma_free_attrs+0x33/0x50 Call Trace: qla2x00_async_sns_sp_done+0x107/0x1b0 [qla2xxx] qla2x00_abort_srb+0x8e/0x250 [qla2xxx] ? ql_dbg+0x70/0x100 [qla2xxx] __qla2x00_abort_all_cmds+0x108/0x190 [qla2xxx] qla2x00_abort_all_cmds+0x24/0x70 [qla2xxx] qla2x00_abort_isp_cleanup+0x305/0x3e0 [qla2xxx] qla2x00_remove_one+0x364/0x400 [qla2xxx] pci_device_remove+0x36/0xa0 __device_release_driver+0x17a/0x230 device_release_driver+0x24/0x30 pci_stop_bus_device+0x68/0x90 pci_stop_and_remove_bus_device_locked+0x16/0x30 remove_store+0x75/0x90 kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x11f/0x1b0 vfs_write+0x1eb/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x5c/0x80 ? do_user_addr_fault+0x1d8/0x680 ? do_syscall_64+0x69/0x80 ? exc_page_fault+0x62/0x140 ? asm_exc_page_fault+0x8/0x30 entry_SYSCALL_64_after_hwframe+0x44/0xae The command was completed in the abort path during driver unload with a lock held, causing the warning in abort path. Hence complete the command without any lock held. Reported-by: Lin Li Tested-by: Lin Li Cc: stable@vger.kernel.org Signed-off-by: Nilesh Javali Link: https://lore.kernel.org/r/20230313043711.13500-2-njavali@marvell.com Reviewed-by: Himanshu Madhani Reviewed-by: John Meneghini Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 636571d3e8209..30a5ca9c5a8d4 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -1738,6 +1738,17 @@ __qla2x00_abort_all_cmds(struct qla_qpair *qp, int res) for (cnt = 1; cnt < req->num_outstanding_cmds; cnt++) { sp = req->outstanding_cmds[cnt]; if (sp) { + /* + * perform lockless completion during driver unload + */ + if (qla2x00_chip_is_down(vha)) { + req->outstanding_cmds[cnt] = NULL; + spin_unlock_irqrestore(qp->qp_lock_ptr, flags); + sp->done(sp, res); + spin_lock_irqsave(qp->qp_lock_ptr, flags); + continue; + } + switch (sp->cmd_type) { case TYPE_SRB: qla2x00_abort_srb(qp, sp, res, &flags);