On 10/20/21 07:54, schspa wrote:
在 2021-10-20星期三的 06:44 +0200，Heinrich Schuchardt写道：
On 10/20/21 04:37, schspa wrote:
在 2021-10-19星期二的 17:23 +0200，Heinrich Schuchardt写道：
On 10/19/21 15:35, zhaohui.shi wrote:
From: schspa schspa@gmail.com
In some case, get_info() interface can be NULL, add this check to stop from crash.
Thank you for reviewing the partition driver code.
There seems to be no driver missing a get_info implementation. Where did you run into a problem?
Yes, I do run into a problem, In my spl build, CONFIG_SPL_FS_EXT4, CONFIG_SPL_FS_FAT, CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION are all not enabled. In this case, get_info implementation is NULL. see 'part_get_info_ptr' and 'part_print_ptr' and part_efi.c for detail.
Why should we only check .get_info and not .test and not .print?
All part type driver have .test implementation, it can't be NULL, and .print have NULL pointer judgement already.
Signed-off-by: schspa schspa@gmail.com
Please, provide a name.
disk/part.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/disk/part.c b/disk/part.c index a6a8f7052b..7af3240ec7 100644 --- a/disk/part.c +++ b/disk/part.c @@ -668,6 +668,13 @@ int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name, part_drv = part_driver_lookup_type(dev_desc); if (!part_drv) return -1;
+ if (!part_drv->get_info) { + PRINTF("## Driver %s does not have the get_info() method\n", + part_drv->name);
Please, use log_debug() to avoid noise on the console on every boot.
I think it's OK to use PRINTF, because of this BUG occurs only when user give a bad part configuration, and this error message can prompt the user that a configuration error has occurred. Besides, 'part_get_info' use PRINTF for this null pointer protection too.
Above you write that part_drv->get_info = NULL is part of your configuration. So it will always be printed. The size of the SPL is very critical on many boards. We should avoid anything that increases it.
Considering this problem, I will upload a new patch to use log_debug() for error message.
Why is part_get_info_by_name_type() being called in your configuration which does not provide a partition driver in SPL? Are there some dependencies missing in the Kconfig files?
In my case, I have CONFIG_SPL_EFI_PARTITION=y CONFIG_SPL_LIBDISK_SUPPORT=y but forget to enable CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION.
Yes, it seems we can have some dependencies in Kconfig like this: config SPL_LIBDISK_SUPPORT bool "Support disk partitions" depends on CONFIG_SPL_EXT_SUPPORT || CONFIG_SPL_FAT_SUPPORT || CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION help
But there is some case for part_iso or part_mac, which have no this dependencies (because of it don't use part_get_info_ptr to wrap part_get_info_iso).
How do you think about this ? Should we add such dependencies ? part_iso seems shouldn't have dependencies about ext, fat, mmcsd etc.
Ideally it should not be possible to configure something that does not compile or will crash. Linux checks random configuration in their CI.
The Kconfig change should be in a separate patch.
Best regards
Heinrich
Best regards
Heinrich
Best regards
Heinrich
+ return -ENOSYS; + }
for (i = 1; i < part_drv->max_entries; i++) { ret = part_drv->get_info(dev_desc, i, info); if (ret != 0) {