netdev - [PATCH NET] net: atlantic: Use readx_poll

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Message-ID: <20200818161439.3dkf6jzp3vuwmvvh@linutronix.de>
Date:   Tue, 18 Aug 2020 18:14:39 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Igor Russkikh <irusskikh@...vell.com>, netdev@...r.kernel.org,
        Mark Starovoytov <mstarovoitov@...vell.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH NET] net: atlantic: Use readx_poll_timeout() for large timeout

Commit
   8dcf2ad39fdb2 ("net: atlantic: add hwmon getter for MAC temperature")

implemented a read callback with an udelay(10000U). This fails to
compile on ARM because the delay is >1ms. I doubt that it is needed to
spin for 10ms even if possible on x86.

>From looking at the code, the context appears to be preemptible so using
usleep() should work and avoid busy spinning.

Use readx_poll_timeout() in the poll loop.

Cc: Mark Starovoytov <mstarovoitov@...vell.com>
Cc: Igor Russkikh <irusskikh@...vell.com>
Signed-off-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
---

Could someone with hardware please verify it? It compiles, yes.

 drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
index 16a944707ba90..8941ac4df9e37 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c
@@ -1631,8 +1631,8 @@ static int hw_atl_b0_get_mac_temp(struct aq_hw_s *self, u32 *temp)
 		hw_atl_ts_reset_set(self, 0);
 	}
 
-	err = readx_poll_timeout_atomic(hw_atl_b0_ts_ready_and_latch_high_get,
-					self, val, val == 1, 10000U, 500000U);
+	err = readx_poll_timeout(hw_atl_b0_ts_ready_and_latch_high_get, self,
+				 val, val == 1, 10000U, 500000U);
 	if (err)
 		return err;
 
-- 
2.28.0