kernel/linux.git/drivers/mmc/core/bus.c, branch linux-7.0.y

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

mmc: core: Add infrastructure for undervoltage handling

2025-08-22T10:08:07+00:00

Implement the core infrastructure to allow MMC bus types to handle REGULATOR_EVENT_UNDER_VOLTAGE events from power regulators. This is primarily aimed at allowing devices like eMMC to perform an emergency shutdown to prevent data corruption when a power failure is imminent. This patch introduces: - A new 'handle_undervoltage' function pointer to 'struct mmc_bus_ops'. Bus drivers (e.g., for eMMC) can implement this to define their emergency procedures. - A workqueue ('uv_work') in 'struct mmc_supply' to handle the event asynchronously in a high-priority context. - A new function 'mmc_handle_undervoltage()' which is called from the workqueue. It stops the host queue to prevent races with card removal, checks for the bus op, and invokes the handler. - Functions to register and unregister the regulator notifier, intended to be called by bus drivers like 'mmc_attach_mmc' when a compatible card is detected. The notifier is only registered for the main vmmc supply, as undervoltage handling for vqmmc or vqmmc2 is not required at this time. Signed-off-by: Oleksij Rempel Link: https://lore.kernel.org/r/20250821130751.2089587-2-o.rempel@pengutronix.de Signed-off-by: Ulf Hansson

mmc: core: Further prevent card detect during shutdown

2024-12-02T14:37:16+00:00

Disabling card detect from the host's ->shutdown_pre() callback turned out to not be the complete solution. More precisely, beyond the point when the mmc_bus->shutdown() has been called, to gracefully power off the card, we need to prevent card detect. Otherwise the mmc_rescan work may poll for the card with a CMD13, to see if it's still alive, which then will fail and hang as the card has already been powered off. To fix this problem, let's disable mmc_rescan prior to power off the card during shutdown. Reported-by: Anthony Pighin Fixes: 66c915d09b94 ("mmc: core: Disable card detect during shutdown") Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson Reviewed-by: Adrian Hunter Closes: https://lore.kernel.org/all/BN0PR08MB695133000AF116F04C3A9FFE83212@BN0PR08MB6951.namprd08.prod.outlook.com/ Tested-by: Anthony Pighin Message-ID: <20241125122446.18684-1-ulf.hansson@linaro.org>

mmc: core: Announce successful insertion of an SD UHS-II card

2024-10-14T10:40:10+00:00

To inform the users about SD UHS-II cards, let's extend the print at card insertion with a "UHS-II" substring. Within this change, it seems reasonable to convert from using "ultra high speed" into "UHS-I speed", for the UHS-I type, as it should makes it more clear. Note that, the new print for UHS-II cards doesn't include the actual selected speed mode. Instead, this is going to be added from subsequent change. Signed-off-by: Ulf Hansson Link: https://lore.kernel.org/r/20240913102836.6144-4-victorshihgli@gmail.com

mmc: core: Cleanup printing of speed mode at card insertion

2024-10-14T10:40:10+00:00

The current print of the bus speed mode in mmc_add_card() has grown over the years and is now difficult to parse. Let's clean up the code and also take the opportunity to properly announce "DDR" for eMMCs as "high speed DDR", which is according to the eMMC spec. Signed-off-by: Ulf Hansson Link: https://lore.kernel.org/r/20240913102836.6144-2-victorshihgli@gmail.com

mmc: sd: SDUC Support Recognition

2024-10-14T10:29:01+00:00

Ultra Capacity SD cards (SDUC) was already introduced in SD7.0. Those cards support capacity larger than 2TB and up to including 128TB. ACMD41 was extended to support the host-card handshake during initialization. The card expects that the HCS & HO2T bits to be set in the command argument, and sets the applicable bits in the R3 returned response. On the contrary, if a SDUC card is inserted to a non-supporting host, it will never respond to this ACMD41 until eventually, the host will timed out and give up. Also, add SD CSD version 3.0 - designated for SDUC, and properly parse the csd register as the c_size field got expanded to 28 bits. Do not enable SDUC for now - leave it to the last patch in the series. Tested-by: Ricky WU Reviewed-by: Adrian Hunter Signed-off-by: Avri Altman Link: https://lore.kernel.org/r/20241006051148.160278-2-avri.altman@wdc.com Signed-off-by: Ulf Hansson

mmc: core: constify the struct device_type usage

2024-02-27T12:48:36+00:00

Since commit aed65af1cc2f ("drivers: make device_type const"), the driver core can properly handle constant struct device_type. Move the sdio_type, sd_type and mmc_type variables to be constant structures as well, placing it into read-only memory which can not be modified at runtime. Cc: Greg Kroah-Hartman Signed-off-by: Ricardo B. Marliere Link: https://lore.kernel.org/r/20240219-device_cleanup-mmc-v1-1-1910e283cf5a@marliere.net Signed-off-by: Ulf Hansson

mmc: core: make mmc_bus_type const

2024-02-13T12:37:28+00:00

Now that the driver core can properly handle constant struct bus_type, move the mmc_bus_type variable to be a constant structure as well, placing it into read-only memory which can not be modified at runtime. Suggested-by: Greg Kroah-Hartman Signed-off-by: Ricardo B. Marliere Reviewed-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20240203-bus_cleanup-mmc-v1-2-ad054dce8dc3@marliere.net Signed-off-by: Ulf Hansson

mmc: core: propagate removable attribute to driver core

2023-08-09T11:21:48+00:00

Userspace can use this to distinguish hotpluggable mmc devices such as sdcards from non-hotpluggable ones such as eMMC. One example is the lsblk tool from util-linux. Note that dev_set_removable() is not related to GENHD_FL_REMOVABLE which is not applicable as per the comment in drivers/mmc/core/block.c Link: https://github.com/util-linux/util-linux/issues/2379 Signed-off-by: Thomas Weißschuh Reviewed-by: Avri Altman Link: https://lore.kernel.org/r/20230725-mmc-removable-v1-1-b2e0c4f18e6d@weissschuh.net Signed-off-by: Ulf Hansson