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mtd: phram: Repair multiple instances support 

Commit b2a2a84d35 (mtd: phram: dot not crash when
built-in and passing boot param) claims to be "based on Ville Herva's similar
patch to block2mtd" (c4e7fb3137), but it has
missed the crucial point of the original path: all these "if(n)def MODULE".
It has broken the possibility to create several phram instances when phram is
compiled as module. The possibility to add instances via /sys writes to
/sys/module/phram/parameters/phram was also broken with mentioned patch.
Proposed patch takes the idea of original block2mtd patch to its full extent.
Assumption "This function is always called before 'init_phram()'" was also
incorrect, so removed the comment. This patch effectively reverts also
b11ec57fc6 (mtd: phram: fix section mismatch for
phram_setup).

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nsn.com>
[Brian: remove static assigment = 0]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
hifive-unleashed-5.1
Alexander Sverdlin 2013-10-14 18:52:23 +02:00 committed by Brian Norris
parent b4c2330577
commit 6f6b9feece
1 changed files with 35 additions and 8 deletions
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43
drivers/mtd/devices/phram.c
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@ -205,6 +205,8 @@ static inline void kill_final_newline(char *str)
return 1; \
} while (0)
#ifndef MODULE
static int phram_init_called;
/*
* This shall contain the module parameter if any. It is of the form:
* - phram=<device>,<address>,<size> for module case
@ -213,9 +215,10 @@ static inline void kill_final_newline(char *str)
* size.
* Example: phram.phram=rootfs,0xa0000000,512Mi
*/
static __initdata char phram_paramline[64 + 20 + 20];
static char phram_paramline[64 + 20 + 20];
#endif
static int __init phram_setup(const char *val)
static int phram_setup(const char *val)
{
char buf[64 + 20 + 20], *str = buf;
char *token[3];
@ -264,17 +267,36 @@ static int __init phram_setup(const char *val)
return ret;
}
static int __init phram_param_call(const char *val, struct kernel_param *kp)
static int phram_param_call(const char *val, struct kernel_param *kp)
{
#ifdef MODULE
return phram_setup(val);
#else
/*
* This function is always called before 'init_phram()', whether
* built-in or module.
* If more parameters are later passed in via
* /sys/module/phram/parameters/phram
* and init_phram() has already been called,
* we can parse the argument now.
*/
if (phram_init_called)
return phram_setup(val);
/*
* During early boot stage, we only save the parameters
* here. We must parse them later: if the param passed
* from kernel boot command line, phram_param_call() is
* called so early that it is not possible to resolve
* the device (even kmalloc() fails). Defer that work to
* phram_setup().
*/
if (strlen(val) >= sizeof(phram_paramline))
return -ENOSPC;
strcpy(phram_paramline, val);
return 0;
#endif
}
module_param_call(phram, phram_param_call, NULL, NULL, 000);
@ -283,10 +305,15 @@ MODULE_PARM_DESC(phram, "Memory region to map. \"phram=<name>,<start>,<length>\"
static int __init init_phram(void)
{
if (phram_paramline[0])
return phram_setup(phram_paramline);
int ret = 0;
return 0;
#ifndef MODULE
if (phram_paramline[0])
ret = phram_setup(phram_paramline);
phram_init_called = 1;
#endif
return ret;
}
static void __exit cleanup_phram(void)