diff options
| author | Venkat Gopalakrishnan <venkatg@codeaurora.org> | 2018-05-03 14:07:20 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-05-18 19:22:47 +0300 |
| commit | 7f6ba4f12e6cbfdefbb95cfd8fc67ece6c15d799 (patch) | |
| tree | 6222a0ae4fb272f93dff985731ef7a36b9602bfc /drivers/scsi/ufs/ufshcd.c | |
| parent | 69a6fff068567469c0ef1156ae5ac8d3d71701f0 (diff) | |
| download | linux-7f6ba4f12e6cbfdefbb95cfd8fc67ece6c15d799.tar.xz | |
scsi: ufs: make sure all interrupts are processed
As multiple requests are submitted to the ufs host controller in
parallel there could be instances where the command completion interrupt
arrives later for a request that is already processed earlier as the
corresponding doorbell was cleared when handling the previous
interrupt. Read the interrupt status in a loop after processing the
received interrupt to catch such interrupts and handle it.
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 2859f6395eea..028492179101 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5489,19 +5489,30 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba) u32 intr_status, enabled_intr_status; irqreturn_t retval = IRQ_NONE; struct ufs_hba *hba = __hba; + int retries = hba->nutrs; spin_lock(hba->host->host_lock); intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); - enabled_intr_status = - intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE); - if (intr_status) - ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS); + /* + * There could be max of hba->nutrs reqs in flight and in worst case + * if the reqs get finished 1 by 1 after the interrupt status is + * read, make sure we handle them by checking the interrupt status + * again in a loop until we process all of the reqs before returning. + */ + do { + enabled_intr_status = + intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE); + if (intr_status) + ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS); + if (enabled_intr_status) { + ufshcd_sl_intr(hba, enabled_intr_status); + retval = IRQ_HANDLED; + } + + intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); + } while (intr_status && --retries); - if (enabled_intr_status) { - ufshcd_sl_intr(hba, enabled_intr_status); - retval = IRQ_HANDLED; - } spin_unlock(hba->host->host_lock); return retval; } |