On Wed, May 04, 2016 at 06:44:45PM -0400, Rich Felker wrote: > Ping. > > On Fri, Apr 22, 2016 at 05:28:42PM -0400, Rich Felker wrote: > > I'm working on a driver for the J-core (http://j-core.org) SPI master, > > which is currently limited to PIO and using the spi-bitbang framework > > (probably not the right thing to use, but planned to change, and seems > > orthogonal to the issue at hand). We're using it to access an SD card > > via the mmc_spi mmc host driver, and experiencing crashes/corruption > > that I tracked down to mmc_rescan (we don't yet have an interrupt for > > media change) happening during SPI message transfers. Which locks are > > supposed to preclude this from happening? Is it likely something wrong > > our driver is using, or is there possibly a general bug in the MMC/SPI > > subsystem(s)? Ping. I'm also experiencing this issue with multiple devices on the same spi bus; access seems completely unsynchronized. While it's hard to rule out the possibility of it being specific to the spi master driver, the driver just implements transfer_one and set_cs, so synchronization would necessarily have to happen at a higher level. Any tips on how I could further track down the cause? Rich -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
