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scsi: lpfc: Fix invalid sleeping context in lpfc_sli4_nvmet_alloc() 

The following calltrace was seen:

BUG: sleeping function called from invalid context at mm/slab.h:494
...
Call Trace:
 dump_stack+0x9a/0xf0
 ___might_sleep.cold.63+0x13d/0x178
 slab_pre_alloc_hook+0x6a/0x90
 kmem_cache_alloc_trace+0x3a/0x2d0
 lpfc_sli4_nvmet_alloc+0x4c/0x280 [lpfc]
 lpfc_post_rq_buffer+0x2e7/0xa60 [lpfc]
 lpfc_sli4_hba_setup+0x6b4c/0xa4b0 [lpfc]
 lpfc_pci_probe_one_s4.isra.15+0x14f8/0x2280 [lpfc]
 lpfc_pci_probe_one+0x260/0x2880 [lpfc]
 local_pci_probe+0xd4/0x180
 work_for_cpu_fn+0x51/0xa0
 process_one_work+0x8f0/0x17b0
 worker_thread+0x536/0xb50
 kthread+0x30c/0x3d0
 ret_from_fork+0x3a/0x50

A prior patch introduced a spin_lock_irqsave(hbalock) in the
lpfc_post_rq_buffer() routine. Call trace is seen as the hbalock is held
with interrupts disabled during a GFP_KERNEL allocation in
lpfc_sli4_nvmet_alloc().

Fix by reordering locking so that hbalock not held when calling
sli4_nvmet_alloc() (aka rqb_buf_list()).

Link: https://lore.kernel.org/r/20201020202719.54726-2-james.smart@broadcom.com
Fixes: 411de511c6 ("scsi: lpfc: Fix RQ empty firmware trap")
Cc: <stable@vger.kernel.org> # v4.17+
Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2020-10-20 13:27:11 -07:00 committed by Martin K. Petersen
parent c8ed1ff88c
commit 62e3a931db
2 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/scsi/lpfc/lpfc_mem.c
View File

@ -588,8 +588,6 @@ lpfc_sli4_rb_free(struct lpfc_hba *phba, struct hbq_dmabuf *dmab)
* Description: Allocates a DMA-mapped receive buffer from the lpfc_hrb_pool PCI
* pool along a non-DMA-mapped container for it.
*
* Notes: Not interrupt-safe. Must be called with no locks held.
*
* Returns:
* pointer to HBQ on success
* NULL on failure
@ -599,7 +597,7 @@ lpfc_sli4_nvmet_alloc(struct lpfc_hba *phba)
{
struct rqb_dmabuf *dma_buf;
dma_buf = kzalloc(sizeof(struct rqb_dmabuf), GFP_KERNEL);
dma_buf = kzalloc(sizeof(*dma_buf), GFP_KERNEL);
if (!dma_buf)
return NULL;

10
drivers/scsi/lpfc/lpfc_sli.c
View File

@ -7248,12 +7248,16 @@ lpfc_post_rq_buffer(struct lpfc_hba *phba, struct lpfc_queue *hrq,
struct rqb_dmabuf *rqb_buffer;
LIST_HEAD(rqb_buf_list);
spin_lock_irqsave(&phba->hbalock, flags);
rqbp = hrq->rqbp;
for (i = 0; i < count; i++) {
spin_lock_irqsave(&phba->hbalock, flags);
/* IF RQ is already full, don't bother */
if (rqbp->buffer_count + i >= rqbp->entry_count - 1)
if (rqbp->buffer_count + i >= rqbp->entry_count - 1) {
spin_unlock_irqrestore(&phba->hbalock, flags);
break;
}
spin_unlock_irqrestore(&phba->hbalock, flags);
rqb_buffer = rqbp->rqb_alloc_buffer(phba);
if (!rqb_buffer)
break;
@ -7262,6 +7266,8 @@ lpfc_post_rq_buffer(struct lpfc_hba *phba, struct lpfc_queue *hrq,
rqb_buffer->idx = idx;
list_add_tail(&rqb_buffer->hbuf.list, &rqb_buf_list);
}
spin_lock_irqsave(&phba->hbalock, flags);
while (!list_empty(&rqb_buf_list)) {
list_remove_head(&rqb_buf_list, rqb_buffer, struct rqb_dmabuf,
hbuf.list);