openkylin
/
platform_kernel-5.15
mirror of https://gitee.com/openkylin/platform_kernel-5.15.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

cpufreq: exynos5440: Protect OPP search calls with RCU lock 

As per the OPP library documentation(Documentation/power/opp.txt) all
OPP find/get calls should be protected by RCU locks.

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Amit Daniel Kachhap 2013-04-22 00:24:37 +02:00 committed by Rafael J. Wysocki
parent c77896693d
commit 70eb0855b2
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/cpufreq/exynos5440-cpufreq.c
View File

@ -120,11 +120,13 @@ static int init_div_table(void)
int i = 0; int i = 0;
struct opp *opp; struct opp *opp;
rcu_read_lock();
for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) { for (i = 0; freq_tbl[i].frequency != CPUFREQ_TABLE_END; i++) {
opp = opp_find_freq_exact(dvfs_info->dev, opp = opp_find_freq_exact(dvfs_info->dev,
freq_tbl[i].frequency * 1000, true); freq_tbl[i].frequency * 1000, true);
if (IS_ERR(opp)) { if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dvfs_info->dev, dev_err(dvfs_info->dev,
"failed to find valid OPP for %u KHZ\n", "failed to find valid OPP for %u KHZ\n",
freq_tbl[i].frequency); freq_tbl[i].frequency);
@ -159,6 +161,7 @@ static int init_div_table(void)
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * i); __raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * i);
} }
rcu_read_unlock();
return 0; return 0;
} }