From: Douglas Anderson dianders@chromium.org
commit b1ac62a7ac386d76968af5f374a4a7a82a35fe31 upstream.
Open-coding a timeout loop invariably leads to errors with handling the timeout properly in one corner case or another. In the case of cqhci we might report "CQE stuck on" even if it wasn't stuck on. You'd just need this sequence of events to happen in cqhci_off():
1. Call ktime_get(). 2. Something happens to interrupt the CPU for > 100 us (context switch or interrupt). 3. Check time and; set "timed_out" to true since > 100 us. 4. Read CQHCI_CTL. 5. Both "reg & CQHCI_HALT" and "timed_out" are true, so break. 6. Since "timed_out" is true, falsely print the error message.
Rather than fixing the polling loop, use readx_poll_timeout() like many people do. This has been time tested to handle the corner cases.
Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host") Signed-off-by: Douglas Anderson dianders@chromium.org Acked-by: Adrian Hunter adrian.hunter@intel.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200413162717.1.Idece266f5c8793193b57a1ddb1066d03... Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mmc/host/cqhci.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-)
--- a/drivers/mmc/host/cqhci.c +++ b/drivers/mmc/host/cqhci.c @@ -13,6 +13,7 @@ #include <linux/delay.h> #include <linux/highmem.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/module.h> #include <linux/dma-mapping.h> #include <linux/slab.h> @@ -351,12 +352,16 @@ static int cqhci_enable(struct mmc_host /* CQHCI is idle and should halt immediately, so set a small timeout */ #define CQHCI_OFF_TIMEOUT 100
+static u32 cqhci_read_ctl(struct cqhci_host *cq_host) +{ + return cqhci_readl(cq_host, CQHCI_CTL); +} + static void cqhci_off(struct mmc_host *mmc) { struct cqhci_host *cq_host = mmc->cqe_private; - ktime_t timeout; - bool timed_out; u32 reg; + int err;
if (!cq_host->enabled || !mmc->cqe_on || cq_host->recovery_halt) return; @@ -366,15 +371,9 @@ static void cqhci_off(struct mmc_host *m
cqhci_writel(cq_host, CQHCI_HALT, CQHCI_CTL);
- timeout = ktime_add_us(ktime_get(), CQHCI_OFF_TIMEOUT); - while (1) { - timed_out = ktime_compare(ktime_get(), timeout) > 0; - reg = cqhci_readl(cq_host, CQHCI_CTL); - if ((reg & CQHCI_HALT) || timed_out) - break; - } - - if (timed_out) + err = readx_poll_timeout(cqhci_read_ctl, cq_host, reg, + reg & CQHCI_HALT, 0, CQHCI_OFF_TIMEOUT); + if (err < 0) pr_err("%s: cqhci: CQE stuck on\n", mmc_hostname(mmc)); else pr_debug("%s: cqhci: CQE off\n", mmc_hostname(mmc));