From 5fe5a6c9acc03bcd98e0d1611b6a0fe17149c6cc Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 25 Aug 2017 01:10:00 +0200 Subject: [PATCH] scsi: lpfc: avoid false-positive gcc-8 warning This is an interesting regression with gcc-8, showing a harmless warning for correct code: In file included from include/linux/kernel.h:13:0, ... from drivers/scsi/lpfc/lpfc_debugfs.c:23: include/linux/printk.h:301:2: error: 'eq' may be used uninitialized in this function [-Werror=maybe-uninitialized] printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) ^~~~~~ In file included from drivers/scsi/lpfc/lpfc_debugfs.c:58:0: drivers/scsi/lpfc/lpfc_debugfs.h:451:31: note: 'eq' was declared here I managed to reduce the warning into a small test case for gcc-8 that I reported in the gcc bugzilla[1]. As a workaround, this changes the logic to move the two assignments of 'eq' out of the conditions and instead make the index conditional. This works for all configurations I tried and avoids adding a bogus initialization. Acked-by: James Smart Link: [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81958 Signed-off-by: Arnd Bergmann Signed-off-by: Martin K. Petersen --- drivers/scsi/lpfc/lpfc_debugfs.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_debugfs.h b/drivers/scsi/lpfc/lpfc_debugfs.h index 7b7d314af0e0..c4edd87bfc65 100644 --- a/drivers/scsi/lpfc/lpfc_debugfs.h +++ b/drivers/scsi/lpfc/lpfc_debugfs.h @@ -478,16 +478,16 @@ lpfc_debug_dump_cq(struct lpfc_hba *phba, int qtype, int wqidx) return; for (eqidx = 0; eqidx < phba->io_channel_irqs; eqidx++) { - eq = phba->sli4_hba.hba_eq[eqidx]; - if (cq->assoc_qid == eq->queue_id) + if (cq->assoc_qid == phba->sli4_hba.hba_eq[eqidx]->queue_id) break; } if (eqidx == phba->io_channel_irqs) { pr_err("Couldn't find EQ for CQ. Using EQ[0]\n"); eqidx = 0; - eq = phba->sli4_hba.hba_eq[0]; } + eq = phba->sli4_hba.hba_eq[eqidx]; + if (qtype == DUMP_FCP || qtype == DUMP_NVME) pr_err("%s CQ: WQ[Idx:%d|Qid%d]->CQ[Idx%d|Qid%d]" "->EQ[Idx:%d|Qid:%d]:\n", -- 2.20.1