Straightforward conversion to sg_map helper. Seeing there is no cleare error path, SG_MAP_MUST_NOT_FAIL which may BUG_ON in certain cases in the future.
Signed-off-by: Logan Gunthorpe logang@deltatee.com Cc: Wolfram Sang wsa+renesas@sang-engineering.com Cc: Ulf Hansson ulf.hansson@linaro.org --- drivers/mmc/host/tmio_mmc.h | 7 +++++-- drivers/mmc/host/tmio_mmc_pio.c | 12 ++++++++++++ 2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index d0edb57..bc43eb0 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -202,17 +202,20 @@ void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i); void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i); irqreturn_t tmio_mmc_irq(int irq, void *devid);
+/* Note: this function may return PTR_ERR and must be checked! */ static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg, unsigned long *flags) { + void *ret; + local_irq_save(*flags); - return kmap_atomic(sg_page(sg)) + sg->offset; + return sg_map(sg, 0, SG_KMAP_ATOMIC | SG_MAP_MUST_NOT_FAIL); }
static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg, unsigned long *flags, void *virt) { - kunmap_atomic(virt - sg->offset); + sg_unmap(sg, virt, 0, SG_KMAP_ATOMIC); local_irq_restore(*flags); }
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index a2d92f1..bbb4f19 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -506,6 +506,18 @@ static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host) if (host->sg_ptr == &host->bounce_sg) { unsigned long flags; void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags); + if (IS_ERR(sg_vaddr)) { + /* + * This should really never happen unless + * the code is changed to use memory that is + * not mappable in the sg. Seeing there doesn't + * seem to be any error path out of here, + * we can only WARN. + */ + WARN(1, "Non-mappable memory used in sg!"); + return; + } + memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length); tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr); }