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When removing the fsl-quadspi module and running 'cat /proc/mtd' afterwards, we see garbage data like: $ rmmod fsl-quadspi $ cat /proc/mtd dev: size erasesize name mtd0: 00000000 00000000 "(null)" mtd0: 00000000 00000000 "(null)" mtd0: 00000000 00000000 "(null)" ... mtd0: a22296c6c756e28 00000000 "(null)" mtd0: a22296c6c756e28 3064746d "(null)" If we continue doing multiple module load/unload operations, then it will also lead to a kernel crash. The reason for this is due to the wrong mtd index used in mtd_device_unregister() in the remove function. We need to keep the mtd unregister index aligned with the one used in the probe function, which means we need to take into account the 'has_second_chip' property. By doing so we can guarantee that the mtd index is the same in the registration and unregistration functions. With this patch applied we can load/unload the fsl-quadspi driver several times and it will result in no crash. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Huang Shijie <shijie.huang@intel.com> Tested-by: Frank Li <Frank.Li@freescale.com> Acked-by: Allen Xu <han.xu@freescale.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com> |
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| .. | ||
| fsl-quadspi.c | ||
| Kconfig | ||
| Makefile | ||
| spi-nor.c | ||