[06/14] lpfc: Fix stack trace seen while setting rrq active

Message ID 20200630215001.70793-7-jsmart2021@gmail.com
State New
Headers show
  • lpfc: Update lpfc to revision
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Commit Message

James Smart June 30, 2020, 9:49 p.m.
Call traces have been observed running different tests that involve aborts
and setting the rrq active flag.  The lpfc_set_rrq_active routine is doing
a mempool_alloc under the soft_irq processing level. When the mempool needs
to get a new buffer from the free pool and has to wait for memory to become
free it will check the flags passed in on the alloc and dump the stack if
the thread is running in interrupt context.

Replace the GFP_KERNEL flag with GFP_ATOMIC so that the memory allocation
will not attempt to sleep if there is no mem available.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
 drivers/scsi/lpfc/lpfc_mem.c | 3 ++-
 drivers/scsi/lpfc/lpfc_sli.c | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)


diff --git a/drivers/scsi/lpfc/lpfc_mem.c b/drivers/scsi/lpfc/lpfc_mem.c
index 726f6619230f..e8c0066eb4aa 100644
--- a/drivers/scsi/lpfc/lpfc_mem.c
+++ b/drivers/scsi/lpfc/lpfc_mem.c
@@ -45,6 +45,7 @@ 
 #define LPFC_MBUF_POOL_SIZE     64      /* max elements in MBUF safety pool */
 #define LPFC_MEM_POOL_SIZE      64      /* max elem in non-DMA safety pool */
 #define LPFC_DEVICE_DATA_POOL_SIZE 64   /* max elements in device data pool */
+#define LPFC_RRQ_POOL_SIZE	256	/* max elements in non-DMA  pool */
 lpfc_mem_alloc_active_rrq_pool_s4(struct lpfc_hba *phba) {
@@ -121,7 +122,7 @@  lpfc_mem_alloc(struct lpfc_hba *phba, int align)
 	if (phba->sli_rev == LPFC_SLI_REV4) {
 		phba->rrq_pool =
-			mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
+			mempool_create_kmalloc_pool(LPFC_RRQ_POOL_SIZE,
 						sizeof(struct lpfc_node_rrq));
 		if (!phba->rrq_pool)
 			goto fail_free_nlp_mem_pool;
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index c598bef5cad4..c439cf9a82c7 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -1079,7 +1079,7 @@  lpfc_set_rrq_active(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
 		goto out;
 	spin_unlock_irqrestore(&phba->hbalock, iflags);
-	rrq = mempool_alloc(phba->rrq_pool, GFP_KERNEL);
+	rrq = mempool_alloc(phba->rrq_pool, GFP_ATOMIC);
 	if (!rrq) {
 		lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
 				"3155 Unable to allocate RRQ xri:0x%x rxid:0x%x"