From: Johannes Berg Date: Fri, 15 Jan 2021 11:05:57 +0000 (+0200) Subject: iwlwifi: pcie: use jiffies for memory read spin time limit X-Git-Tag: accepted/tizen/unified/20230118.172025~7924^2~13^2~11 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6701317476bbfb1f341aa935ddf75eb73af784f9;p=platform%2Fkernel%2Flinux-rpi.git iwlwifi: pcie: use jiffies for memory read spin time limit There's no reason to use ktime_get() since we don't need any better precision than jiffies, and since we no longer disable interrupts around this code (when grabbing NIC access), jiffies will work fine. Use jiffies instead of ktime_get(). This cleanup is preparation for the following patch "iwlwifi: pcie: reschedule in long-running memory reads". The code gets simpler with the weird clock use etc. removed before we add cond_resched(). Signed-off-by: Johannes Berg Signed-off-by: Luca Coelho Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/iwlwifi.20210115130253.621c948b1fad.I3ee9f4bc4e74a0c9125d42fb7c35cd80df4698a1@changeid --- diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index 285e0d5..e3760c4 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -2107,7 +2107,7 @@ static int iwl_trans_pcie_read_mem(struct iwl_trans *trans, u32 addr, while (offs < dwords) { /* limit the time we spin here under lock to 1/2s */ - ktime_t timeout = ktime_add_us(ktime_get(), 500 * USEC_PER_MSEC); + unsigned long end = jiffies + HZ / 2; if (iwl_trans_grab_nic_access(trans, &flags)) { iwl_write32(trans, HBUS_TARG_MEM_RADDR, @@ -2118,11 +2118,7 @@ static int iwl_trans_pcie_read_mem(struct iwl_trans *trans, u32 addr, HBUS_TARG_MEM_RDAT); offs++; - /* calling ktime_get is expensive so - * do it once in 128 reads - */ - if (offs % 128 == 0 && ktime_after(ktime_get(), - timeout)) + if (time_after(jiffies, end)) break; } iwl_trans_release_nic_access(trans, &flags);