From dd9b38039262040c02286b82c413d30b8f0cc6af Mon Sep 17 00:00:00 2001 From: =?utf8?q?David=20Lanzend=C3=B6rfer?= Date: Tue, 16 Dec 2014 15:11:04 +0100 Subject: [PATCH] mmc: sunxi: Lock fix MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 1) Adding a comment in order to clarify the choice of the locks within sunxi_mmc_handle_manual_stop 2) As has pointed out the wait_dma variable was not accessed within the spin lock block in sunxi_mmc_request and so (even if it should never happend) it would have theoretically been possible that some other function would access the variable at the same time as the function. This has been changed now and the function is using local variables outside the lock and copys the value over during the lock phase. Signed-off-by: David Lanzendörfer Reported-by: Acked-by: Hans de Goede Signed-off-by: Ulf Hansson --- drivers/mmc/host/sunxi-mmc.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index 1fe54a889ce3..67e680c128c5 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -572,6 +572,15 @@ static irqreturn_t sunxi_mmc_handle_manual_stop(int irq, void *dev_id) } dev_err(mmc_dev(host->mmc), "data error, sending stop command\n"); + + /* + * We will never have more than one outstanding request, + * and we do not complete the request until after + * we've cleared host->manual_stop_mrq so we do not need to + * spin lock this function. + * Additionally we have wait states within this function + * so having it in a lock is a very bad idea. + */ sunxi_mmc_send_manual_stop(host, mrq); spin_lock_irqsave(&host->lock, iflags); @@ -768,6 +777,7 @@ static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) unsigned long iflags; u32 imask = SDXC_INTERRUPT_ERROR_BIT; u32 cmd_val = SDXC_START | (cmd->opcode & 0x3f); + bool wait_dma = host->wait_dma; int ret; /* Check for set_ios errors (should never happen) */ @@ -818,7 +828,7 @@ static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) if (cmd->data->flags & MMC_DATA_WRITE) cmd_val |= SDXC_WRITE; else - host->wait_dma = true; + wait_dma = true; } else { imask |= SDXC_COMMAND_DONE; } @@ -852,6 +862,7 @@ static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) } host->mrq = mrq; + host->wait_dma = wait_dma; mmc_writel(host, REG_IMASK, host->sdio_imask | imask); mmc_writel(host, REG_CARG, cmd->arg); mmc_writel(host, REG_CMDR, cmd_val); -- 2.34.1