diff options
| author | Madalin Bucur <madalin.bucur@nxp.com> | 2018-12-21 15:41:42 +0100 |
|---|---|---|
| committer | Li Yang <leoyang.li@nxp.com> | 2019-01-18 23:48:35 +0100 |
| commit | 89857a8a5c89a406b967ab2be7bd2ccdbe75e73d (patch) | |
| tree | 2f681909969d9cc805649765bed039b09508f644 /drivers/soc/fsl | |
| parent | Linux 5.0-rc1 (diff) | |
| download | linux-89857a8a5c89a406b967ab2be7bd2ccdbe75e73d.tar.xz linux-89857a8a5c89a406b967ab2be7bd2ccdbe75e73d.zip | |
soc: fsl: qbman: avoid race in clearing QMan interrupt
By clearing all interrupt sources, not only those that
already occurred, the existing code may acknowledge by
mistake interrupts that occurred after the code checks
for them.
Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: Roy Pledge <roy.pledge@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Diffstat (limited to 'drivers/soc/fsl')
| -rw-r--r-- | drivers/soc/fsl/qbman/qman.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/soc/fsl/qbman/qman.c b/drivers/soc/fsl/qbman/qman.c index 52c153cd795a..636f83f781f5 100644 --- a/drivers/soc/fsl/qbman/qman.c +++ b/drivers/soc/fsl/qbman/qman.c @@ -1143,18 +1143,19 @@ static void qm_mr_process_task(struct work_struct *work); static irqreturn_t portal_isr(int irq, void *ptr) { struct qman_portal *p = ptr; - - u32 clear = QM_DQAVAIL_MASK | p->irq_sources; u32 is = qm_in(&p->p, QM_REG_ISR) & p->irq_sources; + u32 clear = 0; if (unlikely(!is)) return IRQ_NONE; /* DQRR-handling if it's interrupt-driven */ - if (is & QM_PIRQ_DQRI) + if (is & QM_PIRQ_DQRI) { __poll_portal_fast(p, QMAN_POLL_LIMIT); + clear = QM_DQAVAIL_MASK | QM_PIRQ_DQRI; + } /* Handling of anything else that's interrupt-driven */ - clear |= __poll_portal_slow(p, is); + clear |= __poll_portal_slow(p, is) & QM_PIRQ_SLOW; qm_out(&p->p, QM_REG_ISR, clear); return IRQ_HANDLED; } |