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GET /api/patches/805153/?format=api
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{
    "id": 805153,
    "url": "http://patchwork.ozlabs.org/api/patches/805153/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/1503503985-3869-1-git-send-email-matthew.tan_1@nxp.com/",
    "project": {
        "id": 46,
        "url": "http://patchwork.ozlabs.org/api/projects/46/?format=api",
        "name": "Intel Wired Ethernet development",
        "link_name": "intel-wired-lan",
        "list_id": "intel-wired-lan.osuosl.org",
        "list_email": "intel-wired-lan@osuosl.org",
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    "msgid": "<1503503985-3869-1-git-send-email-matthew.tan_1@nxp.com>",
    "list_archive_url": null,
    "date": "2017-08-23T15:59:45",
    "name": "e1000e: changed some expensive calls of udelay to usleep_range",
    "commit_ref": null,
    "pull_url": null,
    "state": "changes-requested",
    "archived": false,
    "hash": "42995448bac7391adc5003c060ac3b8c72d1ca7e",
    "submitter": {
        "id": 72211,
        "url": "http://patchwork.ozlabs.org/api/people/72211/?format=api",
        "name": "nxf23276",
        "email": "matthew.tan_1@nxp.com"
    },
    "delegate": {
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        "url": "http://patchwork.ozlabs.org/api/users/68/?format=api",
        "username": "jtkirshe",
        "first_name": "Jeff",
        "last_name": "Kirsher",
        "email": "jeffrey.t.kirsher@intel.com"
    },
    "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/1503503985-3869-1-git-send-email-matthew.tan_1@nxp.com/mbox/",
    "series": [],
    "comments": "http://patchwork.ozlabs.org/api/patches/805153/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/805153/checks/",
    "tags": {},
    "related": [],
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        "From": "Matthew Tan <matthew.tan_1@nxp.com>",
        "To": "<jeffrey.t.kirsher@intel.com>",
        "Date": "Wed, 23 Aug 2017 10:59:45 -0500",
        "Message-ID": "<1503503985-3869-1-git-send-email-matthew.tan_1@nxp.com>",
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        "Cc": "michael.kardonik@nxp.com, mitch.a.williams@intel.com,\n\tlinux-kernel@vger.kernel.org, john.ronciak@intel.com,\n\tintel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,\n\tMatthew Tan <matthew.tan_1@nxp.com>",
        "Subject": "[Intel-wired-lan] [PATCH] e1000e: changed some expensive calls of\n\tudelay to usleep_range",
        "X-BeenThere": "intel-wired-lan@osuosl.org",
        "X-Mailman-Version": "2.1.18-1",
        "Precedence": "list",
        "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n\t<intel-wired-lan.osuosl.org>",
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        "Content-Type": "text/plain; charset=\"us-ascii\"",
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        "Errors-To": "intel-wired-lan-bounces@osuosl.org",
        "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>"
    },
    "content": "Calls to udelay are not preemtable by userspace so userspace\n    applications experience a large (~200us) latency when running on core\n    0. Instead usleep_range can be used to be more friendly to userspace\n    since it is preemtable. This is due to udelay using busy-wait loops\n    while usleep_rang uses hrtimers instead. It is recommended to use\n    udelay when the delay is <10us since at that precision overhead of\n    usleep_range hrtimer setup causes issues. However, the replaced calls\n    are for 50us and 100us so this should not be not an issue.\n\nSigned-off-by: Matthew Tan <matthew.tan_1@nxp.com>\n---\n drivers/net/ethernet/intel/e1000e/phy.c | 8 ++++----\n 1 file changed, 4 insertions(+), 4 deletions(-)",
    "diff": "diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c\nindex de13aea..e318fdc 100644\n--- a/drivers/net/ethernet/intel/e1000e/phy.c\n+++ b/drivers/net/ethernet/intel/e1000e/phy.c\n@@ -158,7 +158,7 @@ s32 e1000e_read_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 *data)\n \t * the lower time out\n \t */\n \tfor (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 3); i++) {\n-\t\tudelay(50);\n+\t\tusleep_range(40, 60);\n \t\tmdic = er32(MDIC);\n \t\tif (mdic & E1000_MDIC_READY)\n \t\t\tbreak;\n@@ -183,7 +183,7 @@ s32 e1000e_read_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 *data)\n \t * reading duplicate data in the next MDIC transaction.\n \t */\n \tif (hw->mac.type == e1000_pch2lan)\n-\t\tudelay(100);\n+\t\tusleep_range(90, 100);\n \n \treturn 0;\n }\n@@ -222,7 +222,7 @@ s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data)\n \t * the lower time out\n \t */\n \tfor (i = 0; i < (E1000_GEN_POLL_TIMEOUT * 3); i++) {\n-\t\tudelay(50);\n+\t\tusleep_range(40, 60);\n \t\tmdic = er32(MDIC);\n \t\tif (mdic & E1000_MDIC_READY)\n \t\t\tbreak;\n@@ -246,7 +246,7 @@ s32 e1000e_write_phy_reg_mdic(struct e1000_hw *hw, u32 offset, u16 data)\n \t * reading duplicate data in the next MDIC transaction.\n \t */\n \tif (hw->mac.type == e1000_pch2lan)\n-\t\tudelay(100);\n+\t\tusleep_range(90, 110);\n \n \treturn 0;\n }\n",
    "prefixes": []
}