kernel/drivers/mmc/core/pwrseq_simple.c, branch linux-6.9.y

mmc: pwrseq_simple: Convert to platform remove callback returning void

2023-08-15T10:48:20Z

The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is (mostly) ignored and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new() which already returns void. Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Cc: Uwe Kleine-König Signed-off-by: Yangtao Li Link: https://lore.kernel.org/r/20230727070051.17778-53-frank.li@vivo.com Signed-off-by: Ulf Hansson

mmc: pwrseq_simple: include deferred probe reasons

2023-01-23T14:51:38Z

This adds a reason to /sys/kernel/debug/devices_deferred, which makes it easier to debug deferred probes such as [0]. 0. https://lore.kernel.org/all/20221228140708.26431-1-tom@tom-fitzhenry.me.uk/ Signed-off-by: Tom Fitzhenry Link: https://lore.kernel.org/r/20221228142354.28454-1-tom@tom-fitzhenry.me.uk Signed-off-by: Ulf Hansson

mmc: pwrseq: Use bitmap_free() to free bitmap

2021-12-28T16:53:42Z

kfree() and bitmap_free() are the same. But using the later is more consistent when freeing memory allocated with bitmap_alloc(). Signed-off-by: Christophe JAILLET Link: https://lore.kernel.org/r/07a8e48db446888bd77f16b88568e80904f52103.1640528089.git.christophe.jaillet@wanadoo.fr Signed-off-by: Ulf Hansson

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194

2019-05-30T18:29:22Z

Based on 1 normalized pattern(s): license terms gnu general public license gpl version 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 161 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Alexios Zavras Reviewed-by: Steve Winslow Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170027.447718015@linutronix.de Signed-off-by: Greg Kroah-Hartman

mmc: pwrseq_simple: Fix incorrect handling of GPIO bitmap

2018-10-15T14:26:00Z

Commit b9762bebc633 ("gpiolib: Pass bitmaps, not integer arrays, to get/set array") changed the way GPIO values are passed to gpiod_get/set_array_value() and friends. The new code introduced into mmc_pwrseq_simple_set_gpios_value() incorrectly interpretes the 'value' argument as a bitmap of GPIO values and assigns it directly to the 'values' bitmap variable passed to gpiod_set_array_value_cansleep() instead of filling that bitmap with bits equal to the 'value' argument. As a result, only member 0 of the array is handled correctly. Moreover, wrong assumption is taken about the 'values' bitmap size not exceding the number of bits of the 'value' argument type. Fix it. Signed-off-by: Janusz Krzysztofik Tested-by: Marek Szyprowski Acked-by: Ulf Hansson Signed-off-by: Linus Walleij

gpiolib: Pass array info to get/set array functions

2018-09-13T09:16:54Z

In order to make use of array info obtained from gpiod_get_array() and speed up processing of arrays matching single GPIO chip layout, that information must be passed to get/set array functions. Extend the functions' API with that additional parameter and update all users. Pass NULL if a user builds an array itself from single GPIOs. Cc: Jonathan Corbet Cc: Miguel Ojeda Sandonis Cc: Geert Uytterhoeven Cc: Sebastien Bourdelin Cc: Lukas Wunner Cc: Peter Korsgaard Cc: Peter Rosin Cc: Andrew Lunn Cc: Florian Fainelli Cc: "David S. Miller" Cc: Rojhalat Ibrahim Cc: Dominik Brodowski Cc: Russell King Cc: Kishon Vijay Abraham I Cc: Tony Lindgren Cc: Lars-Peter Clausen Cc: Michael Hennerich Cc: Jonathan Cameron Cc: Hartmut Knaack Cc: Peter Meerwald-Stadler Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: Yegor Yefremov Cc: Uwe Kleine-König Signed-off-by: Janusz Krzysztofik Acked-by: Ulf Hansson Signed-off-by: Linus Walleij

gpiolib: Pass bitmaps, not integer arrays, to get/set array

2018-09-13T09:15:30Z

Most users of get/set array functions iterate consecutive bits of data, usually a single integer, while processing array of results obtained from, or building an array of values to be passed to those functions. Save time wasted on those iterations by changing the functions' API to accept bitmaps. All current users are updated as well. More benefits from the change are expected as soon as planned support for accepting/passing those bitmaps directly from/to respective GPIO chip callbacks if applicable is implemented. Cc: Jonathan Corbet Cc: Miguel Ojeda Sandonis Cc: Sebastien Bourdelin Cc: Lukas Wunner Cc: Peter Korsgaard Cc: Peter Rosin Cc: Andrew Lunn Cc: Florian Fainelli Cc: "David S. Miller" Cc: Rojhalat Ibrahim Cc: Dominik Brodowski Cc: Russell King Cc: Kishon Vijay Abraham I Cc: Tony Lindgren Cc: Lars-Peter Clausen Cc: Michael Hennerich Cc: Jonathan Cameron Cc: Hartmut Knaack Cc: Peter Meerwald-Stadler Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: Yegor Yefremov Cc: Uwe Kleine-König Signed-off-by: Janusz Krzysztofik Acked-by: Ulf Hansson Reviewed-by: Geert Uytterhoeven Tested-by: Geert Uytterhoeven Signed-off-by: Linus Walleij

mmc: pwrseq: Use kmalloc_array instead of stack VLA

2018-05-02T13:08:29Z

The use of stack Variable Length Arrays needs to be avoided, as they can be a vector for stack exhaustion, which can be both a runtime bug (kernel Oops) or a security flaw (overwriting memory beyond the stack). Also, in general, as code evolves it is easy to lose track of how big a VLA can get. Thus, we can end up having runtime failures that are hard to debug. As part of the directive[1] to remove all VLAs from the kernel, and build with -Wvla. Currently driver is using a VLA declared using the number of descriptors. This array is used to store integer values and is later used as an argument to `gpiod_set_array_value_cansleep()` This can be avoided by using `kmalloc_array()` to allocate memory for the array of integer values. Memory is free'd before return from function. >From the code it appears that it is safe to sleep so we can use GFP_KERNEL (based _cansleep() suffix of function `gpiod_set_array_value_cansleep()`. It can be expected that this patch will result in a small increase in overhead due to the use of `kmalloc_array()` [1] https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Tobin C. Harding Signed-off-by: Ulf Hansson

mmc: pwrseq_simple: Parse DTS for the power-off-delay-us property

2017-05-23T12:17:36Z

If the optional power-off-delay-us property is found, insert the corresponding delay after asserting the GPIO during power off. This enables a graceful shutdown sequence for some devices. Cc: linux-mmc@vger.kernel.org Signed-off-by: Ulf Hansson Acked-by: Arnd Bergmann

mmc: pwrseq-simple: Add an optional post-power-on-delay

2016-09-26T19:31:07Z

Some devices need a while to boot their firmware after providing clks / de-asserting resets before they are ready to receive sdio commands. This commits adds a post-power-on-delay-ms devicetree property to mmc-pwrseq-simple for use with such devices. Signed-off-by: Hans de Goede Acked-by: Rob Herring Signed-off-by: Ulf Hansson